What was found
FOLLOWING TAKEOFF, MAIN GEAR RETRACTION RED UNSAFE LIGHT REMAINED ILLUMINATED. GEAR WAS RECYCLED AND ALL GREEN DOWN/LOCKED WAS INDICATED. AIRCRAFT RETURNED TO POINT OF DEPARTURE. AIRCRAFT RETURNED TO ISP FOR INSPECTION AND EVALUATION. NO DISCREPANCIES NOTED DURING FERRY FLIGHT. LANDING GEAR INSTALLATION, MICRO-SWITCHES AND SIDESTAYS INSPECTED AND ADJUSTMENTS CHECKED FOR PROPER RIGGING. ACCOMPLISHED SUCCESSFUL GEAR SYSTEM SWINGS AND FUNCTIONAL CHECKS. NO DEFECTS WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE. (M)